Is anyone keeping track of the amounts, concentration and frequency at which you are applying the coffee? This can vary your results as much as any fertilizer.
I am wondering if different people are sticking to one "specific method" of these variables, or if some people are just making a pot of coffee and giving the plant a cup!? (I would like to know what people have decided is the "ideal dose". Oh yea, decaf or regular?
I once worked with a woman years ago who only watered the plant on her desk with her left over coffee. I inherited it when she finally nearly killed it. (Yea, too much of anything can be a bad thing.) In this case the plant was a nice velvety gloxinia. The first time I watered it with fresh water, nearly black "coffee" came out of the bottom!
I just am throwing that out there, so people remember that even though it is just coffee, it can still be overdone.
Keep in mind, coffee or fertilizer won't make up for sub-standard growing conditions. In fact, the right conditions are needed in order for the plant to make use of the available nutrients.
Nice lookin' plants here! Can't argue with success!